Spray a 9x13-inch baking pan with cooking spray. Arrange the bread in a single layer in the baking pan. Whisk together the milk, eggs, egg whites, maple syrup, vanilla, and cinnamon. Pour the egg mixture over the bread in the pan, spreading it around so the liquid saturates the bread. Scatter the blueberries evenly on top. Sprinkle with the almonds and brown sugar. Cover and refrigerate for at least 9 hours or overnight.